CAS number： 57808-65-8
Molecular formula： C22H14Cl2I2N2O2
molecular weight： 663.0737
Chemical structure：
| Product | Closantel | |
| Shelf Life | 1 year | |
| Specification | In-house specification (QS-1034.01-D) | |
| Test Items | Specifications | Results |
| Appearance | White or almost white powder | Almost white powder |
| Identification | Complies with reference spectrum | Complies |
| Total Impurities | ≤2.0% | 0.5% |
| Reduction product | ≤1.0％ | 0.05% |
| 3,5-diiosalicylic acid | ≤1.0％ | 0.11% |
| Other individual impurity | ≤1.0％ | 0.42% |
| Loss on drying | ≤0.5% | 0.1% |
| Assay | 98.0%～102.0% | 99.5% |
